Probe pad, substrate having a semiconductor device, method of testing a semiconductor device and tester for testing a semiconductor device

ABSTRACT

In an embodiment, a semiconductor device is tested using a probe pad that includes a probing region with which a probe needle makes contact, and a sensing region bordering an edge of the probing region. Electrical signals are applied, and measured results indicate the probe needle&#39;s location relative to a test position on the semiconductor device.

CROSS REFERENCE TO RELATED APPLICATION

This application is a Divisional of U.S. patent application Ser. No.11/131,767, filed on May 17, 2005, now pending, which claims priorityunder 35 U.S.C. § 119 from Korean Patent Application No. 2004-35260,filed on May 18, 2004, in the Korean Intellectual Property Office, theentire contents of which are hereby incorporated by reference

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an apparatus and a method of testing asemiconductor device. More particularly, the present invention relatesto a probe pad for electrically testing a semiconductor device, asubstrate on which a semiconductor device is formed, a method of testinga semiconductor device, and a tester for testing a semiconductor device.

2. Description of the Related Art

Generally, a semiconductor device may be manufactured by a depositionprocess, a photolithography process, an etching process, an ionimplantation process, a metal wiring process, etc. The above processesmay be repeatedly carried out to form a plurality of semiconductordevices (hereinafter, referred to as chips) on a substrate.

After the chips are formed on the substrate, an electric die sorting(EDS) process for electrically testing the chips is performed on thesubstrate. According to the EDS process, a pre-laser test fordetermining whether the chips are normal or abnormal is performed. Alaser repair process for repairing repairable chips among the abnormalchips is executed. A post-laser test for determining whether therepaired chips are normal or abnormal is carried out. A final test isthen performed for determining whether the chips are normal or abnormalunder conditions that are different from those in the pre-laser test andthe post-laser test.

In the EDS process, after electrical signals are applied to pads on eachof the chips, outputted data is determined to be normal or abnormal. Toinput/output the electrical signals into/from the pads, probe needlesfor transmitting the electrical signals make contact with the pads,respectively.

However, when the number of semiconductor devices having high capacityincrease, number of pads for inputting/outputting the electrical signalsalso increase. Also, to reduce time for testing the chips on thesubstrate, the chips are wholly tested through one EDS process bysimultaneously contacting the probe needles with the pads.

Since the numbers of the pads are increased, the probe needles may notaccurately make contact with the pads, respectively. Further, asdescribed above, since several EDS processes are executed on one chipand the probe needles make contact with the pads in the respective EDSprocesses, the probe needles make contact with the pads several times.Therefore, it is quite important that the probe needles accurately makecontact with the pads.

When the probe needle makes contact with an edge of the pad, the pad maybe greatly damaged by the probe needle. Further, the contact between theprobe needle and the edge of the pad may not be detected by anelectrical open/short test so that a probe failure may be generated,thereby determining a corresponding chip to be abnormal. As a result, anormal chip is treated to be abnormal so that yield of manufacturing asemiconductor device may be greatly reduced.

A method for preventing damage of a semiconductor device due to a probeneedle is disclosed in Japanese Patent Laid-Open Publication No.1996-111431. According to the method, a probe pad is divided into aninclined probe region and a bonding region.

However, the probe pad may have an increased area due to the division ofthe probe pad. Also, when the probe needle makes contact with an edge ofthe probe pad, the above-mentioned probe failure may be generated.Further, the conventional method may not be employable in a wafer levelpackage that is currently sold.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a probe pad that is capableof detecting a probe failure.

Embodiments of the present invention also provide a substrate having asemiconductor device on which the above-mentioned probe pad is mounted.

Embodiments of the present invention still also provide a method oftesting the above-mentioned semiconductor device having the probe pad.

Embodiments of the present invention still also provide a tester fortesting the above-mentioned semiconductor device having the probe pad.

A probe pad in accordance with one embodiment of the present inventionincludes a probing region with which a probe needle makes contact, and asensing region bordering an edge of the probing region.

A substrate having a semiconductor device in accordance with anotherembodiment of the present invention includes a first pad forinputting/outputting data signals into/from the semiconductor device,and a second pad including a probing region with which a probe needlemakes contact and a sensing region bordering an edge of the probingregion.

In a method of testing a semiconductor device in accordance with stillanother embodiment of the present invention, probe needles make contactwith a first pad for inputting/outputting data signals into/from thesemiconductor device, and a second pad including a probing region withwhich a probe needle makes contact and a sensing region bordering anedge of the probing region, respectively. A determination is made as towhether or not there is a contact between the sensing region of thesecond pad and the probe needle. The electrical signal is applied to thefirst pad to test the semiconductor device in accordance with therecognized contact.

A tester for testing a semiconductor device in accordance with stillanother embodiment of the present invention includes an electricalsignal applicator for applying a first electrical signal to a first padand a second pad, respectively. The first pad is used forinputting/outputting data signals into/from the semiconductor device.The second pad is used for testing a position of a probe needle thatmakes contact with the first pad. An electrical signal measurer measuresa second signal outputted from the second pad. A controller controlswhether a test of the semiconductor device proceeds or not in accordancewith the measured second signal.

According to the present invention, after the contact between the probeneedle and the probe pad in an EDS process is recognized, thesemiconductor device is tested.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features and advantages of the invention will becomereadily apparent by reference to the following detailed description whenconsidered in conjunction with the accompanying drawings.

FIG. 1 is a plan view illustrating a probe pad in accordance with afirst embodiment of the present invention.

FIG. 2 is a cross sectional view taken along line II-II′ in FIG. 1.

FIGS. 3 and 4 are cross sectional views illustrating the probe pad inFIG. 1 in accordance with other variations.

FIG. 5 is a plan view illustrating a probe pad in accordance with asecond embodiment of the present invention.

FIG. 6 is a plan view illustrating a probe pad in accordance with athird embodiment of the present invention.

FIG. 7 is a plan view illustrating a probe pad in accordance with afourth embodiment of the present invention.

FIG. 8 is a plan view illustrating a probe pad in accordance with afifth embodiment of the present invention.

FIG. 9 is a cross sectional view taken along line IX-IX′ in FIG. 8.

FIG. 10 is a cross sectional view illustrating a probe pad in accordancewith a sixth embodiment of the present invention.

FIGS. 11 to 13 are plan views illustrating a substrate having asemiconductor device in accordance with a seventh embodiment of thepresent invention.

FIG. 14 is a cross sectional view illustrating a second pad of thesemiconductor device in FIGS. 11 to 13.

FIG. 15 is a plan view illustrating a substrate having a semiconductordevice in accordance with an eighth embodiment of the present invention.

FIGS. 16 to 18 are plan views illustrating a substrate having asemiconductor device in accordance with a ninth embodiment of thepresent invention.

FIG. 19 is a plan view illustrating a substrate having a semiconductordevice in accordance with a tenth embodiment of the present invention.

FIG. 20 is a plan view illustrating a substrate having a semiconductordevice in accordance with an eleventh embodiment of the presentinvention.

FIG. 21 is a cross sectional view illustrating a second pad of thesemiconductor device in FIG. 20.

FIG. 22 is a plan view illustrating a substrate having a semiconductordevice in accordance with a twelfth embodiment of the present invention.

FIG. 23 is a cross sectional view illustrating a second pad of thesemiconductor device in FIG. 22.

FIG. 24 is a plan view illustrating a substrate having a semiconductordevice in accordance with a thirteenth embodiment of the presentinvention.

FIG. 25 is a flow chart illustrating a method of testing a semiconductordevice in accordance with an embodiment of the present invention.

FIG. 26 is a flow chart illustrating a method of testing a semiconductordevice in accordance with another embodiment of the present invention.

FIG. 27 is a plan view illustrating a contact between a semiconductordevice and a probe card.

FIGS. 28 and 29 are plan views illustrating a method of testing asemiconductor device in accordance with a fourteenth embodiment of thepresent invention.

FIG. 30 is a plan view illustrating a method of testing a semiconductordevice in accordance with a fifteenth embodiment of the presentinvention.

FIG. 31 is a block diagram illustrating a tester for testing asemiconductor device in accordance with a seventeenth embodiment of thepresent invention.

DESCRIPTION OF THE EMBODIMENTS

The present invention now will be described more fully hereinafter withreference to the accompanying drawings, in which embodiments of theinvention are shown. This invention may, however, be embodied in manydifferent forms and should not be construed as limited to theembodiments set forth herein; rather, these embodiments are provided sothat this disclosure will be thorough and complete, and will fullyconvey the scope of the invention to those skilled in the art. In thedrawings, the thickness of layers and regions are exaggerated forclarity. Like reference numerals refer to similar or identical elementsthroughout. It will be understood that when an element such as a layer,a region or a substrate is referred to as being “on” or “onto” anotherelement, it can be directly on the other element or intervening elementsmay also be present.

Embodiment 1

FIG. 1 is a plan view illustrating a probe pad in accordance with afirst embodiment of the present invention. FIG. 2 is a cross sectionalview taken along line II-II′ in FIG. 1.

A probe pad 10 in accordance with the present embodiment includes arectangular probing region 10 a. The probing region 10 a corresponds toa region with which a probe needle normally makes contact. The probingregion 10 a has first sides and second sides shorter than the firstsides. The second sides are substantially perpendicular to the firstsides. Particularly, the second sides are substantially parallel to asliding direction of a probe needle.

The probing region 10 a includes an insulation material. Examples of theinsulation material are silicon oxide, silicon nitride, etc. When theprobe needle strongly makes contact with the probing region 10 aincluding silicon nitride, the probing region 10 a may be broken. Thus,in the preferred embodiment, the probing region 10 a includes siliconoxide.

A sensing region 10 b borders an edge of the probing region 10 a.Namely, the sensing region 10 b encloses the edge of the probing region10 a. The sensing region 10 b is used for sensing whether the probeneedle makes contact with a region beyond the probing region 10 a. Thesensing region 10 b includes a conductive material such as a metal.

The sensing region 10 b has a width d1 extending the first and secondsides of the probing region 10 a. Accordingly, the probe pad 10including the probing region 10 a and the sensing region 10 b has arectangular shape.

When the probe needle makes contact with the sensing region 10 b, aposition failure of the probe needle is detected. Thus, when the widthd1 of the sensing region 10 b is too narrow, the position failure of theprobe needle may be insufficiently detected. On the contrary, when thewidth d1 of the sensing region 10 b is too wide, the position failure ofthe probe needle may be excessively detected. Accordingly, the width d1of the sensing region 10 b is preferably about 2 μm to about 20 μm.

Referring to FIG. 2, the probing region 10 a and the sensing region 10 bhave upper faces, respectively, that are positioned on substantially thesame plane.

FIGS. 3 and 4 are cross sectional views illustrating the probe pad inFIG. 1 in accordance with other variations.

Referring to FIGS. 3 and 4, stepped portions are formed between theprobing region 10 a and the sensing region 10 b. Namely, as shown inFIG. 3, the sensing region 10 b has an upper face higher than that ofthe probing region 10 a. Also, as shown in FIG. 4, the sensing region 10b has an upper face lower than that of the probing region 10 a. Here,the difference between heights of the probing region 10 a and thesensing region 10 b is restricted within a depth allowing a contactbetween the probe needle and the probing region 10 a or the sensingregion 10 b.

The sensing region 10 b is electrically connected to a sensing circuit14. The sensing circuit 14 includes a resistor electrically connected tothe sensing region 10 b and a ground, respectively. Examples of theresistor are a resistance, a diode, (a P-N junction diode or a MOSdiode), etc. Alternatively, the sensing region 10 b may be electricallyconnected to a ground without being electrically connected to a resistoror diode.

As described above, the sensing region 10 b encloses the probing region10 a so that each part of the sensing region 10 b is entirely connectedto each other part. Therefore, one sensing circuit 14 is electricallyconnected to the sensing region 10 b.

Embodiment 2

FIG. 5 is a plan view illustrating a probe pad in accordance with asecond embodiment of the present invention. The probe pad 15 inaccordance with the present embodiment includes elements substantiallyidentical to those of the probe pad 10 in accordance with Embodiment 1except for configurations.

The probe pad 15 in accordance with the present embodiment includes asquare probing region 15 a. The probing region 15 a corresponds to aregion with which a probe needle normally makes contact. The probingregion 15 a includes an insulation material. Examples of the insulationmaterial are silicon oxide, silicon nitride, etc. In the preferredembodiment, the probing region 15 a includes silicon oxide.

A sensing region 15 b borders an edge of the probing region 15 a.Namely, the sensing region 15 b encloses the edge of the probing region15 a. The sensing region 15 b is used for sensing whether the probeneedle makes contact with a region beyond the probing region 15 a. Thesensing region 15 b includes a conductive material such as a metal.

The sensing region 15 b has one or more widths that extend the sides ofthe probing region 15 a. The widths of the sensing region 15 b aresubstantially identical to, or different from, each other. Namely, thesensing region 15 b may have a square shape, as shown in FIG. 5, or arectangular shape. That is, the sensing region 15 b can either form asquare periphery about the square probing region 15 a, or a rectangularperiphery (not shown) about the square probing region 15 a.

Embodiment 3

FIG. 6 is a plan view illustrating a probe pad in accordance with athird embodiment of the present invention.

A probe pad 20 in accordance with the present embodiment includes arectangular probing region 20 a. Alternatively, the probe pad 20 mayhave a square shape. The probing region 20 a corresponds to a regionwith which a probe needle normally makes contact. The probing region 20a includes a conductive material such as a metal.

A sensing region 20 b borders an edge of the probing region 20 a.Namely, the sensing region 20 b encloses the edge of the probing region20 a. The sensing region 20 b is used for sensing whether the probeneedle makes contact with a region beyond the probing region 20 a. Thesensing region 20 b includes an insulation material. Examples of theinsulation material are silicon oxide, silicon nitride, etc.

The probing region 20 a is electrically connected to a sensing circuit24. The sensing circuit 24 includes a resistor electrically connected tothe probing region 20 a and a ground, respectively. Examples of theresistor are a resistance, a diode, (a P-N junction diode or a MOSdiode), etc. Alternatively, the probing region 20 a may be electricallyconnected to a ground without being electrically connected to a resistoror diode.

When the probe needle makes contact with the sensing region 20 b, aposition failure of the probe needle is detected. On the contrary, whenthe probe needle makes contact with the probing region 20 a and thesensing region 20 b together, the position failure of the probe needleis not detected. Therefore, the sensing region 20 b may have a widthwider than that of the sensing region 10 b in Embodiment 1.

When the width d2 of the sensing region 20 b is too narrow, the positionfailure of the probe needle may be insufficiently detected. On thecontrary, when the width of the sensing region 20 b is too wide, theposition failure of the probe needle may be excessively detected.Accordingly, the width of the sensing region 10 b is preferably about 2μm to about 20 μm.

Embodiment 4

FIG. 7 is a plan view illustrating a probe pad in accordance with afourth embodiment of the present invention.

A probe pad 30 in accordance with the present embodiment includes arectangular probing region 30 a. Alternatively, the probe pad 30 mayhave a square shape. The probing region 30 a has first sides and secondsides shorter than the first sides. The second sides are substantiallyperpendicular to the first sides. Particularly, the second sides aresubstantially parallel to a sliding direction of a probe needle.

Two sensing regions 30 b border the second sides of the probing region30 a. Alternatively, one sensing region 30 b may border any one of thesecond sides. Also, the sensing regions 30 b may border the first sidesof the probing region 30 a. The sensing regions 30 b have a width ofabout 2 μm to about 20 μm.

Here, a position failure of the probe needle may be frequently generatedat the second sides substantially parallel to the sliding direction ofthe probe needle. Thus, the sensing regions 30 b preferably borders thesecond sides of the probing region 30 a. Hereinafter, the slidingdirection of the probe needle is referred to as a Y-direction and adirection substantially perpendicular to the Y-direction is referred toas an X-direction.

As shown in FIG. 7, when the sensing regions 30 b are formed at thesecond sides of the probing region 30 a, the sensing regions 30 b areseparated from each other. Thus, after the separated sensing regions 30b are electrically connected to each other, the sensing regions 30 b areelectrically connected to a sensing circuit 34. Alternatively, thesensing regions 30 b may be electrically connected to two separatesensing circuits 34, respectively. The sensing circuit 34 includes aresistor electrically connected to the sensing region 30 b and a ground,respectively. Examples of the resistor are a resistance, a diode (a P-Njunction diode or a MOS diode), etc.

Embodiment 5

FIG. 8 is a plan view illustrating a probe pad in accordance with afifth embodiment of the present invention. FIG. 9 is a cross sectionalview taken along line IX-IX′ in FIG. 8.

A probe pad 40 in accordance with the present embodiment includes arectangular probing region 42. Alternatively, the probing region 42 mayhave a square shape. To sense whether a probe needle makes contact witha region beyond the probing region 42, a sensing region 43 borders anedge of the probing region 42.

The probing region 42 includes a first region 42 a including a firstmaterial and a second region 42 b including a second material differentfrom, and harder than, the first material. The first material includesan insulation material such as silicon oxide or silicon nitride. Thesecond material includes a metal. The first region 42 a borders thesensing region 43. The second region 42 b is placed in the first region42 a. Thus, the second region 42 b is not contiguous with the sensingregion 43. The second region 42 b prevents a structure from beingdamaged under the probe pad 40 due to a contact of the probe needle.

The sensing region 43 includes a conductive material such as a metal.The sensing region 43 has a width that extends sides of the probingregion 42. The width of the sensing region 43 is about 2 μm to about 20μm. The sensing region 43 is electrically connected to a sensing circuit44.

Referring to FIG. 9, the first region 42 a has an upper face lower thanthat of the second region 42 b. A step difference between the upperfaces of the first and second regions 42 a and 42 b is about 3,000 Å toabout 8,000 Å.

The first region 42 a has a width that extends sides of the sensingregion 43. When the width of the first region 42 a is too narrow, thesecond region 42 b is partially detached due to the contact of the probeneedle so that a short between the second region 42 b and the sensingregion 43 may be generated. On the contrary, when the width of the firstregion 42 a is too wide, the probe needle may be damaged. Accordingly,the width of the first region 42 a is preferably about 2 μm to about 20μm.

Also, the upper face of the second region 42 b and an upper face of thesensing region 43 are positioned on a substantially same plane.

Additionally, a protection layer 46 including an insulation material maybe formed on the second region 42 b and the sensing region 43. Theprotection layer 46 has a thickness to be removed by a pressure appliedfrom the probe needle. The thickness of the protection layer 46 may beabout 100 Å to about 2,000 Å. The protection layer 46 includes theinsulation material substantially identical to that of the first region42 a. The sensing regions 43 are electrically connected to a sensingcircuit 44. The sensing circuit 44 includes a resistor electricallyconnected to the sensing region 43 and a ground, respectively. Examplesof the resistor are a resistance, a diode (a P-N junction diode or a MOSdiode), etc.

Embodiment 6

FIG. 10 is a cross sectional view illustrating a probe pad in accordancewith a sixth embodiment of the present invention.

A probe pad 50 in accordance with the present embodiment includes arectangular probing region 52. Alternatively, the probing region 52 mayhave a square shape. To sense whether a probe needle makes contact witha region beyond the probing region 52, a sensing region 54 borders anedge of the probing region 52.

The probing region 52 includes a first region 52 a including a firstmaterial, and a second region 52 b including a second material differentfrom, and harder than, the first material. The first material includesan insulation material and the second material includes a metal. Thefirst region 52 a borders the sensing region 54. The second region 52 bis placed in the first region 52 a. Thus, the second region 52 b is notconnected to the sensing region 54.

The first and second regions 52 a and 52 b have upper faces that arepositioned on a substantially same plane. Namely, a step differencebetween the upper faces of the first and second regions 52 a and 52 bdoes not exist.

Additionally, a protection layer (not shown) including an insulationmaterial may be formed on the first and second regions 52 a and 52 b andthe sensing region 54. The protection layer has a thickness to beremoved by a pressure applied from the probe needle.

Embodiment 7

FIGS. 11 to 13 are plan views illustrating a substrate having asemiconductor device in accordance with a seventh embodiment of thepresent invention. FIG. 14 is a cross sectional view illustrating asecond pad of the semiconductor device in FIGS. 11 to 13.

A substrate 100 is divided into chip regions 102 and scribe lanes 104between the chip regions 102. A plurality of semiconductor devices isformed in the chip regions 102, respectively.

Structures in each semiconductor device are formed in the chip regions102, respectively. A plurality of first pads 110 forinputting/outputting data signals into/from the unitary semiconductordevice is provided on the structures. The first pads 110 include aconductive material. A passivation layer (not shown) for protecting thefirst pads 110 may be formed at a periphery of the first pads 110.Additionally, a protection circuit (not shown) for electricallyprotecting the first pads 110 may be electrically connected to the firstpads 110. The protection circuit includes a resistor connected to aground. Examples of the resistor are a resistance, a diode, (a P-Njunction diode or a MOS diode), etc.

A second pad 10, which was introduced in FIG. 1, is formed on the chipregion 102. The second pad 10 is used for recognizing a normal contactbetween the first pad 110 and a probe needle.

In particular, the second pad 10 includes a probing region 10 a withwhich the probe needle makes contact, and a sensing region 10 bbordering an edge of the probing region 10 a. The sensing region 10 b isused for sensing whether the probe needle makes contact with a regionbeyond the probing region 10 a. The second pad 10 is substantiallyidentical to the probe pad in Embodiment 1. Thus, any furtherillustrations of the second pad 10 are omitted.

A resistor including a sensing circuit that is electrically connected tothe second pad 10 has a resistance value lower than that of the resistorin the protection circuit. The second pad 10 does not participate inoperations of the semiconductor device. However, the second pad 10 maybe used for recognizing the normal contact of the probe needle. Theresistor of the sensing circuit, with the relatively low resistancevalue, increases a measurement sensitivity with respect to any positionfailure of the probe needle.

The first and second pads 110 and 10 have substantially identicalconfigurations. The second pad 10 may be arranged parallel to the firstpad 110. The second pad 10 may be provided to only a singlesemiconductor device, respectively, as shown in FIG. 11. Alternatively,the second pad 10 may be provided to a group including at least twosemiconductor devices.

As shown in FIG. 12, two or more second pads 10 are provided to thesingle semiconductor device. When a plurality of second pads 10 isprovided to the single semiconductor device, the second pads 10 occupy alarge area on the semiconductor device, although capacity for sensing anelectrical signal is increased. Additionally, any one of the second pads10 may have a width d3. The rest of the second pads 10 may have a widthd4 wider than the width d3. Therefore, an accurate position on the firstand second pads 110 and 10 with which the probe needle makes contact maybe obtained.

In particular, when the second pads 10 including the sensing regions 10b that have different widths are provided to the single semiconductordevice, the probe needles make contact with the second pads 10,respectively. Here, the probe needles may make contact with the probingregions 10 a or the sensing regions 10 b. Alternatively, any one of theprobe needles may make contact with the sensing region 10 b having thewidth d4 in the second pad 10 having the width d4 and the rest of theprobe needles may make contact with the probing region 10 a of thesecond pad 10 that includes the sensing region 10 b having the width d3.Therefore, the position on the first and second pads 110 and 10 withwhich the probe needle makes contact may be indirectly recognized byusing the contact between the probe needle and the probing region 10 aor the sensing region 10 b in accordance with the different widths.

As shown in FIG. 13, only single second pad 10 is provided to the group,including two semiconductor devices. Therefore the number of the secondpads 10 provided to the substrate 100 is reduced. As a result, thenumber of signal channels of a tester, which is configured toelectrically connected to the second pads 10, may be decreased.

Referring to FIG. 14, only an insulation layer pattern 130 includingsilicon oxide is formed between a lower face of the probing region 10 ain the second pad 10 and a lower bulk substrate 90. When a structure isformed under the lower face of the probing region 10 a, the structuremay be damaged by the contact between the second pad 10 and the probeneedle.

A barrier pattern 132 is formed at sides of the insulation layerpattern. The barrier pattern 132 prevents the probe needles frominserting into structures at a periphery of the insulation layer pattern130. Thus, the barrier pattern 132 includes a material such as a metalharder than the insulation layer pattern 130.

Embodiment 8

FIG. 15 is plan view illustrating a substrate having a semiconductordevice in accordance with an eighth embodiment of the present invention.The substrate in accordance with the present embodiment includeselements substantially identical to those of the substrate in accordancewith Embodiment 7 except sizes of a second pad. Thus, same referencenumerals refer to same elements and any further illustrations of thesame elements are omitted.

Referring to FIG. 15, the second pad 10 includes second sides that areparallel to a sliding direction of a probe needle. The second sides ofthe second pad 10 have a length substantially identical to that ofsecond sides of the first pad 110. Additionally, first sides of thesecond pad substantially perpendicular to the second sides may have alength shorter than that of first sides of the first pad 110.

According to the present embodiment, the second pad 10 occupies arelatively small area on the substrate.

Embodiment 9

FIGS. 16 to 18 are plan views illustrating a substrate having asemiconductor device in accordance with a ninth embodiment of thepresent invention. The substrate in accordance with the presentembodiment includes elements substantially identical to those of thesubstrate in accordance with Embodiment 7 except position of a secondpad. Thus, same reference numerals refer to same elements and anyfurther illustrations of the same elements are omitted.

A substrate 100 is divided into chip regions 102 and scribe lanes 104between the chips regions 102. A plurality of semiconductor devices (notshown) is formed in the chip regions 102, respectively.

A plurality of first pads 110 for inputting/outputting data signalsinto/from each of the semiconductor devices is provided on thesemiconductor devices. The first pads 110 include a conductive material.A protection circuit (not shown) for electrically protecting the firstpads 110 may be electrically connected to the first pads 110. Theprotection circuit includes a resistor connected to a ground.

A second pad 10 is formed on the scribe lanes 104. The second pad 10 isused for recognizing a normal contact between the first pad 110 and aprobe needle. The second pad 10 includes a probing region 10 a withwhich the probe needle makes contact, and a sensing region 10 bbordering an edge of the probing region 10 a. The sensing region 10 b isused for sensing whether the probe needle makes contact with a regionbeyond the probing region 10 a. The second pad 10 is substantiallyidentical to the probe pad in Embodiment 1. Thus, any furtherillustrations of the second pad 10 are omitted.

The second pad 10 may be arranged parallel to the first pads 110. Thesecond pad 10 has a configuration and a size substantially identical tothose of the first pads 110. Single second pad 10 may be arranged on thescribe lane 104 that is positioned between adjacent two semiconductordevices. Alternatively, a single second pad 10 may be arranged on thescribe lane 104 that is positioned between groups including at least onesemiconductor device.

As shown in FIG. 16, a single second pad 10 is arranged on the scribelane 104 between two semiconductor devices.

As shown in FIG. 17, a plurality of second pads 10 is arranged on thescribe lane 104 between two semiconductor devices.

As shown in FIG. 18, a pair of second pads 10 is arranged on the scribelane 104 between the groups including one semiconductor device.

According to the present embodiment, when the second pad 10 is arrangedon the scribe lane 104, an area of the chip region is not reduced due tothe second pad 10. Also, the substrate is sawed along the scribe lane104 so that a final semiconductor device may have an originalconfiguration.

Embodiment 10

FIG. 19 is plan view illustrating a substrate having a semiconductordevice in accordance with a tenth embodiment of the present invention.The substrate in accordance with the present embodiment includeselements substantially identical to those of the substrate in accordancewith Embodiment 9 except sizes of a second pad. Thus, same referencenumerals refer to same elements and any further illustrations of thesame elements are omitted.

Referring to FIG. 19, the second pad 10 includes second sides that areparallel to a sliding direction (Y-direction) of a probe needle. Thesecond sides of the second pad 10 have a length substantially identicalto that of second sides of the first pad 110. Additionally, first sidesof the second pad that are substantially parallel to an X-direction thatis substantially perpendicular to the Y-direction may have a lengthshorter than that of first sides of the first pad 110.

The present embodiment may be employed if a length of the scribe lane104 in the X-direction is shorter than that of first sides of the firstpad 110.

Embodiment 11

FIG. 20 is a plan view illustrating a substrate having a semiconductordevice in accordance with an eleventh embodiment of the presentinvention. FIG. 21 is a cross sectional view illustrating a second padof the semiconductor device in FIG. 20.

A substrate 100 is divided into chip regions 102 and scribe lanes 104between the chip regions 102. A plurality of semiconductor devices isformed in the chip regions 102, respectively.

Structures 130 in the single semiconductor device are formed in the chipregions 102, respectively. A plurality of first pads 210 forinputting/outputting data signals into/from the single semiconductordevice is provided on the structures. The first pads 210 include aconductive material. A passivation layer (not shown) for protecting thefirst pads 210 is formed at a periphery of the first pads 210.Additionally, a protection circuit (not shown) for electricallyprotecting the first pads 210 may be electrically connected to the firstpads 210. The protection circuit may include a resistor connected to aground. Examples of the resistor are a resistance, a diode, (a P-Njunction diode or a MOS diode), etc.

A second pad 20 is formed on the chip region 102. The second pad 20 isused for recognizing a normal contact between the first pad 210 and aprobe needle.

In particular, the second pad 20 includes a probing region 20 a withwhich the probe needle makes contact, and a sensing region 20 bbordering an edge of the probing region 20 a. The sensing region 20 b isused for sensing whether the probe needle makes contact with a regionbeyond the probing region 20 a. The second pad 20 is substantiallyidentical to the probe pad in Embodiment 3. Thus, any furtherillustrations of the second pad 20 are omitted.

Referring to FIG. 21, the structures 130 are formed between a lower faceof the probing region 20 a and the substrate 100. Since the probingregion 20 a includes a conductive material harder than an insulationmaterial, the structures 130 may not be damaged by the probe needle. Apassivation layer 26 including polyimide is formed at peripheries of thefirst and second pads 210 and 20.

Alternatively, a conductive pattern (not shown) or an insulation pattern(not shown) in place of the structures 130 may be formed between theprobing region 20 a and the substrate 100.

The first and second pads 210 and 20 have substantially identicalconfigurations and sizes. Alternatively, the second pad 20 may havesides in the Y-direction substantially identical to those of the firstpad 210.

The second pad 20 is arranged on the chip region 102. Each second pad 20is arranged on each of the semiconductor devices. Alternatively, thesecond pad 20 may be arranged on a group including at least onesemiconductor device.

The second pad 20 may be arranged on the scribe lane 104. A singlesecond pad 20 is arranged on the scribe lane 104 between twosemiconductor devices. The second pad 20 may be arranged on the scribelane 104 between groups including at least one semiconductor device.

Embodiment 12

FIG. 22 is a plan view illustrating a substrate having a semiconductordevice in accordance with a twelfth embodiment of the present invention.FIG. 23 is a cross sectional view illustrating a second pad of thesemiconductor device in FIG. 22.

A substrate 100 is divided into chip regions 102 and scribe lanes 104between the chip regions 102. A plurality of semiconductor devices isformed in the chip regions 102, respectively.

A plurality of first pads 310 for inputting/outputting data signalsinto/from each of the semiconductor devices is provided on the chipregions 102, respectively. The first pads 310 include a conductivematerial. Additionally, a protection circuit (not shown) forelectrically protecting the first pads 310 may be electrically connectedto the first pads 310. The protection circuit may include a resistorconnected to a ground.

A second pad 40 for recognizing a normal contact between the first pad310 and a probe needle includes a probing region 42 with which the probeneedle makes contact, and a sensing region 44 bordering an edge of theprobing region 42. The sensing region 44 is used for sensing whether theprobe needle makes contact with a region beyond the probing region 42.The second pad 40 is substantially identical to the probe pad inEmbodiment 5. Thus, any further illustrations of the second pad 40 areomitted.

Referring to FIG. 23, structures 130 are formed between a lower face ofthe probing region 42 and the substrate 100. Since the probing region 42includes a conductive material harder than an insulation material, thestructures 130 may not be damaged due to the probe needle. A passivationlayer 48 including polyimide is formed at peripheries of the first andsecond pads 310 and 40.

Alternatively, a conductive pattern (not shown) or an insulation pattern(not shown) in place of the structures 130 may be formed between theprobing region 42 and the substrate 100.

The first and second pads 310 and 40 have substantially identicalconfigurations and sizes. Alternatively, the second pad 40 may havesides in the Y-direction substantially identical to those of the firstpad 210.

The second pad 40 is arranged on the chip region 102. Each second pad 40is arranged on each of the semiconductor devices. Alternatively, thesecond pad 40 may be arranged on a group including at least onesemiconductor device.

The second pad 40 may be arranged on the scribe lane 104. A singlesecond pad 40 may be arranged on the scribe lane 104 between twosemiconductor devices. Also, the second pad 40 may be arranged on thescribe lane 104 between groups including at least one semiconductordevice.

Embodiment 13

FIG. 24 is a plan view illustrating a substrate having a semiconductordevice in accordance with a thirteenth embodiment of the presentinvention. A second pad 30 in accordance with the present embodiment issubstantially identical to that in Embodiment 4. Thus, same referencenumerals refer to same elements and any further illustrations of thesame elements are omitted.

The second pad 30 is arranged on the chip region 102. Each second pad 30is arranged on each of the semiconductor devices. Alternatively, thesecond pad 30 may be arranged on a group including at least onesemiconductor device.

The second pad 30 may be arranged on the scribe lane 104. A singlesecond pad 30 may be arranged on the scribe lane 104 between twosemiconductor devices. Also, the second pad 30 may be arranged on thescribe lane 104 between groups including at least one semiconductordevice.

Hereinafter, methods of testing a semiconductor device on the substratesin Embodiments 7 to 13 are illustrated in detail.

When semiconductor devices are constituted on a semiconductor substrate,the semiconductor devices are electrically tested by an EDS process. Inthe EDS process, probe needles make contact with pads on each of thesemiconductor devices to input/output a signal into/from the pads.

Generally, the probe needle has a tip making contact with the pad. Thetip may have an “L” shape. Thus, a contact area between the probe needleand the pad may vary in accordance with an inclined angle of the tip.Here, when the inclined angle of the tip is relatively small or when theprobe needle is not aligned with the probe pad, the probe pad may bedamaged if the probe needle makes contact with an edge of the probe padthat is parallel to a sliding direction of the probe needle. Therefore,a process for determining whether the probe needle normally makescontact with the probe pad is included in a process for testing thesemiconductor device.

FIG. 25 is a flow chart illustrating a method of testing a semiconductordevice in accordance with an embodiment of the present invention. FIG.27 is a plan view illustrating a contact between a semiconductor deviceand a probe card.

Referring to FIGS. 25 and 27, in step S10, the probe needles 150 makecontact with the first pads 110 for inputting/outputting data signalsinto/from the semiconductor device and the second pads 10, including theprobing region 10 a and the sensing region 10 b at the edge of theprobing region 10 a, respectively.

In particular, a probe card having the probe needles 150 is aligned withthe substrate. The probe needles 150 then make contact with the firstand second pads 110 and 10, respectively. Here, the probe needles 150simultaneously make contact with the first and second pads 110 and 10 ineach of the semiconductor devices, so that each of the semiconductordevices is simultaneously tested by a following process.

In step S12, a determination is made as to whether or not there is acontact between the probe needles 150 and the sensing region 10 b.

Particularly, a current is selectively provided to the second pad 10through the probe needles 150. A voltage at the second pad 10 is thenmeasured. Here, a voltage due to the probe needles 150 making contactwith the probing region 10 a is quite different from a voltage due tothe probe needles 150 making contact with the sensing region 10 b. Avoltage range to be measured when the probe needles 150 make contactwith the probing region 10 a is set. When a measured voltage is beyondthe voltage range, the contact between the probe needles 150 and thesensing region 10 b is recognized. Here, when any one among the measuredvoltages is beyond the voltage range, the contact between the probeneedles 150 and the probe pad is determined to be abnormal.

When the current is selectively provided to the second pad 10 throughthe probe needles 150, the current may be provided to the second padusing separate channels for inputting/outputting an electrical signal.However, if the number of channels is less than the number of secondpads 10, then a channel for inputting/outputting the electrical signalinto/from any one among the first pads 110 may be commonly used forproviding the current to more than one second pad 10.

In the present embodiment, the voltage is measured after the current isprovided. On the contrary, the current may be measured after the voltageis applied to test the position failure of the probe needle.

If an abnormal contact between the probe needles 150 and the sensingregion 10 b is determined in step S14, then an alignment between theprobe card and the first and second pads 110 and 10 is corrected in stepS16. To correct the alignment, the probe needles 150 are separated fromthe first and second pads 110 and 10. The probe needles 150 are againaligned with the first and second pads 110 and 10.

On the contrary, if it is determined that the probe needles 150 make anormal contact with the probing region 10 a, and not the sensing region10 b, then a first test is performed on the semiconductor in step S18.Here, the first test may include a wafer burn-in test, a pre-laser test,a post-laser test, etc.

When the first test is completed, the probe needles 150 are separatedfrom the first and second pads 110 and 10. Additionally, after the firsttest is completed, a laser repair process or a second test may befurther performed. To perform the laser repair process or the secondtest, the probe card is aligned with the first and second pads 110 and10. In step S20, the probe needles 150 again make contact with the firstand second pads 110 and 10.

In step S22, it's determined if there is a contact between the probeneedles 150 and the sensing region 10 b during the first test. When theprobe needles 150 make contact with the sensing region 10 b, the sensingregion 10 b may be damaged or deformed. Thus, when the probe needles 150make contact with the sensing region 10 b in the first test, the resultof testing the positions of the probe needles 150 may not be reliable.

When the probe needles 150 make contact with the sensing region 10 b inthe first test, the process for determining the contact between theprobe needles 150 and the sensing region 10 b is omitted. In step S30, asecond test is carried out.

On the contrary, when the probe needles 150 normally make contact withthe probing region 10 a, in step S24, the probe needles 150 makingcontact with the sensing region 10 b is examined.

In step S30, when the contact between the probe needles 150 and theprobing region 10 a is recognized, the second test is carried out.However, when the contact between the probe needles 150 and the sensingregion 10 b is recognized, in step S28, an alignment between the probecard and the pads 110 and 10 is corrected. In steps S20 and S22, theprobe needles 150 again make contact with the pads 110 and 10 and thenthe tests are repeatedly performed.

FIG. 26 is a flow chart illustrating a method of testing a semiconductordevice in accordance with another embodiment of the present invention.The method of the present embodiment includes processes substantiallyidentical to those until the first test, illustrated with reference toFIG. 25, is completed.

When the first test illustrated with reference to FIG. 25 is completed,the probe needles 150 are separated from the first and second pads 110and 10. Additionally, after the first test is completed, the laserrepair process or the second test may be performed. To perform the laserrepair process or the second test, the probe card is aligned with thefirst and second pads 110 and 10. In step S20, the probe needles 150again make contact with the first and second pads 110 and 10.

In step S40, a contact between the probe needles 150 and the sensingregion 10 b in the first test is recognized. In step S42, when the probeneedles 150 do not make contact with the sensing region 10 b in thefirst test, a second test is directly carried out in step S48.

On the contrary, in step S42, when the probe needles 150 make contactwith the sensing region 10 b, the probe needles 150 making contact withthe sensing region 10 b in the first test is examined.

In step S44, when the probe needles 150 make contact with the sensingregion 10 b in the first test, the process for recognizing the contactbetween the probe needles 150 and the sensing region 10 b is omitted. Instep S48, the second test is directly carried out.

On the contrary, when the probe needles 150 normally make contact withthe probing region 10 a, in step S44, an alignment between the probecard and the pads 110 and 10 is corrected in step S46. In steps S20 andS22, the probe needles 150 again make contact with the pads 110 and 10and then the tests are repeatedly performed.

Embodiment 14

FIGS. 28 and 29 are plan views illustrating a method of testing asemiconductor device in accordance with a fourteenth embodiment of thepresent invention. The method of the present embodiment is employed intesting the semiconductor devices in Embodiments 7, 8, 9, 10, 12 and 13.

A pre-laser test in the method of the present embodiment is illustratedin detail.

The probe needles make contact with the first pads forinputting/outputting data signals into/from the semiconductor device andthe second pads including the probing region and the sensing region atthe edge of the probing region, respectively.

In particular, a probe card having the probe needles is aligned with thesubstrate. The probe needles then make contact with the first and secondpads, respectively. Here, the probe needles simultaneously make contactwith the first and second pads in each semiconductor device so that thesemiconductor device is simultaneously tested by a following process.

An open/short test for recognizing an electrical connection between thefirst pads and the probe needles is carried out. When a failure in theopen/short test is not generated, a contact between the probe needlesand the sensing region is examined. When the probe needles make contactwith the sensing region, a contact between the probe card and the firstand second pads is determined to be abnormal.

Referring to FIGS. 28 and 29, in the present embodiment, a current ofabout −10 μA to −500 μA is selectively provided to the second pad 10through the probe needles 150. A voltage range is set in providing thecurrent. The voltage range may be about −3V to about −5V. Here, thecurrent may be provided to the second pad 10 through the probe needles150 using four separate channels for inputting/outputting an electricalsignal.

A voltage of the second pad 10 is then measured. Here, as shown in FIG.28, when the probe needles 150 make contact with the probing region 10a, the contact between the probe needles 150 and the first and secondpads 110 and 10 is determined to be normal. Since the probing region 10a is not electrically connected to anything, the probing region 10 a isin floating state. Thus, when the current of about −10 μA to −500μ isprovided to the second pad 10, the voltage is decreased by a minusvoltage to the vicinity of the voltage range.

On the contrary, as shown in FIG. 29, when the probe needles 150 makecontact with the sensing region 10 b, the contact between the probeneedles 150 and the pads 110 and 10 is determined to be abnormal. Sincethe sensing region 10 b includes the conductive material, the currentflows through the sensing circuit 14. Thus, when the sensing circuit 14has a low resistance, the voltage is increased to a vicinity of about0V. Moreover, when the sensing region 10 b is directly connected to theground without the resistor, the measured voltage is about 0V.

When the measured voltage is beyond the voltage range, it is determinedthat the probe needles 150 make contact with the sensing region 10 b.For example, if the measured voltage is about −200 mV to about −6,000mV, it is determined that the probe needles 150 do not make contact withthe sensing region 10 b. However, the voltage range as a standard ofjudgment may vary in accordance with the current, the resistor in thesensing circuit 14, etc., so that the voltage range is not limitedwithin the above-mentioned range.

When the probe needles 150 do not make contact with the sensing region10 b, the contact between the probe needles 150 and the probe pad isdetermined to be normal. A first test is then carried out on thesemiconductor device. Here, the first test may include a standby currenttest, an operation current test, a leakage current test, etc.

When the probe needles 150 make contact with the sensing region 10 b, analignment between the probe card and the first and second pads 110 and10 is corrected before initially testing the semiconductor device. Tocorrect the alignment, the probe needles 150 are separated from thefirst and second pads 110 and 10. The probe card is realigned with thefirst and second pads 110 and 10. The probe needles 150 again makecontact with the first and second pads 110 and 10. The first test iscarried out on the semiconductor device.

After the first test is completed, the probe needles 150 are separatedfrom the first and second pads 110 and 10.

When the above-mentioned pre-laser test is completed, the laser repairprocess for repairing repairable chips among chips that are classifiedto be abnormal is performed.

When the laser repair process is completed, the post-laser test forrecognizing whether or not the repair process is normally carried out isexecuted. Here, the repaired chips are determined to be normal orabnormal by the post-laser test. The post-laser test is substantiallysimilar to the pre-laser test. Thus, any further illustrations of thepost-laser test are omitted.

An open/short test for recognizing an electrical connection between thefirst pads and the probe needles is carried out. When a failure in theopen/short test is not generated, a contact between the probe needles150 and the sensing region 10 b in the previous processes is examined.

When the probe needles 150 make contact with the sensing region 10 b inthe pre-laser test, a second test is directly carried out. The secondtest is substantially identical to the first test in the pre-laser test.

On the contrary, when the probe needles 150 normally make contact withthe probing region 10 a, in step S24, a contact between the probeneedles 150 and the sensing region 10 b is examined.

When the probe needles 150 do not make contact with the sensing region10 b, the contact between the probe needles 150 and the probe pad isdetermined to be normal. However, when the probe needles 150 makecontact with the sensing region 10 b, an alignment between the probecard and the pads 110 and 10 is corrected. After the probe needles 150again make contact with the first and second pads 110 and 10, the secondtest is repeatedly performed.

Chips determined to be normal in the pre-laser test and the post-lasertest are finally tested.

The final test is substantially identical to the post-laser test.Particularly, the final test includes the open/short test and the testfor examining the alignment of the probe card substantially identical tothe post-laser test. After the above processes are performed, a thirdtest corresponding to an actually electrical test is carried out. Thethird test is carried out under conditions that are different from thoseof the first and second tests. The EDS process is completed by theabove-mentioned processes.

Embodiment 15

FIG. 30 is a plan view illustrating a method of testing a semiconductordevice in accordance with a fifteenth embodiment of the presentinvention.

The method of the present embodiment is employed in testing thesemiconductor devices in Embodiments 7, 8, 9, 10, 12 and 13. Also, themethod of the present embodiment is substantially identical to that inEmbodiment 14 except a process for examining contact positions betweenprobe pads and probe needles. Therefore, only the process for examiningthe contact position between the probe pads and the probe needles isillustrated herein.

As described above with reference to FIGS. 28 and 29, the probe needlesmake contact with the first pads for inputting/outputting data signalsinto/from the semiconductor device and the second pads including theprobing region and the sensing region at the edge of the probing region,respectively.

Referring to FIG. 30, first, second and third channels CH1, CH2, and CH3for inputting/outputting electrical signals into/from the first pads 110through the probe needles 150 are provided. The channels CH1, CH2, andCH3 are electrically connected to the first pads 110, respectively. Thethird channel CH3 electrically connected to the first pad 110 iscommonly coupled to the probe needle 150 making contact with the secondpad 10. Thus, the third channel CH3 is referred to as a common channel.

A current of about −10 μA to −500 μA is selectively provided to thesecond pad 10 through the probe needles 150 using the common channel CH3that is electrically connected to the second pad 10. A voltage range isset in providing the current. The voltage range may be about −3V toabout −5V. When the current is provided to the second pad 10 using thechannels, the current is provided to the first pad 110 coupled to thechannels as well as the second pad 10.

A voltage of the second pad 10 is then measured. The current provided tothe first pad 110 flows to the ground through the protection circuit112. Here, since the probing region 10 a is not electrically connectedto anything, the probing region 10 a is in a floating state.

On the contrary, when the probe needles 150 make contact with thesensing region 10 b, the current flows to the ground through the sensingcircuit so that current paths are formed in the first and second pads110 and 10, respectively. Thus, the voltage is closer to about 0Vcompared to that in the contact between the probe needles 150 and theprobing region 10 a.

A voltage range for conditions with the probe needles 150 normallymaking contact with the probing region 10 a is set using the voltagedifference. When the measured voltage is beyond the voltage range, thecontact between the probe needles 150 and the sensing region 10 b isdetermined.

When the contact positions of the probe needles 150 are examined usingthe method of the present embodiment, a resistor in the sensing circuitpreferably has a resistance lower than that of a resistor in theprotection circuit.

Embodiment 16

Hereinafter, a method of testing a semiconductor device in accordancewith a sixteenth embodiment is illustrated. The method of the presentembodiment is employed in testing the semiconductor devices inEmbodiment 11.

The method of the present embodiment is substantially identical to thatin Embodiment 14 except a process for examining contact positionsbetween probe pads and probe needles. Therefore, only the process forexamining the contact position between the probe pads and the probeneedles is illustrated herein.

Referring to FIG. 20, the probe needles make contact with the first pads210 for inputting/outputting data signals into/from the semiconductordevice and the second pads 20 including the probing region and thesensing region at the edge of the probing region, respectively.

A current of about −10 μA to about −500 μA is selectively provided tothe second pad 20 through the probe needles. A voltage range is set inproviding the current. The voltage range may be about −3V to about −5V.When the current is provided to the second pad 20 using the channels,the current is provided to the second pad 20 using separated channels.

A voltage of the second pad 20 is then measured. When the probe needlesmake contact with the probing region 20 a, the current flows to theground through the sensing circuit 24 (see FIG. 6) electricallyconnected to the probing region 20 a because the probing region 20 aincludes a conductive material. Thus, when the sensing circuit 24 has alow resistance, the voltage is increased to about 0V. Moreover, when theprobing region 20 b is directly connected to the ground without theresistor, the measured voltage is about 0V.

On the contrary, when the probe needles make contact with the sensingregion 20 b, the sensing region 20 b is in a floating state because thesensing region 20 b is not electrically connected to anything andincludes an insulation material. Thus, when the current of about −10 μAto about −500 μA is provided to the second pad 10, the voltage isdecreased by a minus voltage to the vicinity of the voltage range.

A voltage range for conditions with the probe needles normally makingcontact with the probing region 20 a is set using the voltagedifference. When the measured voltage is beyond the voltage range, thecontact between the probe needles and the sensing region 20 b isdetermined.

Alternatively, a channel electrically connected to the first pad 210 maybe coupled to the probe needle making contact with the second pad 20.The channel may be commonly used. The normal contact between the probecard and the substrate is examined using the above-mentioned methods.

Embodiment 17

FIG. 31 is a block diagram illustrating a tester for testing asemiconductor device in accordance with a seventeenth embodiment of thepresent invention.

A tester 400 in accordance with the present embodiment includes a holder402 for holding a probe card. The probe card includes probe needlesmaking contact with first and second pads formed on a semiconductordevice. When the semiconductor device is replaced with another one,positions and sizes of the pads on the semiconductor device may bechanged. Thus, the holder 402 is configured so that the probe cardcorresponding to the replaced semiconductor device is to be remounted.

Test conditions are stored in a test-programming unit 404 by test itemsof the semiconductor device. The semiconductor device is tested using aprogram in the test-programming unit 404 that is feasible for testingthe semiconductor device.

An electrical signal-applying unit 406 applies an electrical signal tothe first pad for inputting/outputting data signals into/from thesemiconductor device and the second pad for examining an alignmentbetween the probe needles and the first pad. The electricalsignal-applying unit 406 applies the electrical signal, whichcorresponds to each of the test conditions in the test-programming unit404, to the first and second pads. The electrical signal-applying unit406 includes a plurality of channels for inputting/outputting theelectrical signal into/from the first and second pads. The numbers ofthe channels correspond to effective numbers of the first pads. Here,the effective numbers of the first pads are numbers of the first padsinto/from which at least one electrical signal is inputted/outputted inprocessing the test items.

A signal-measuring unit 408 measures the electrical signal outputtedfrom the first and second pads. A controller 410 receives a measuredsignal from the signal-measuring unit 408 and orders the test of thesemiconductor device.

For example, to recognize the normal contact of the probe needles, thesignal-measuring unit 408 measures a voltage in the second pad. When themeasured voltage is within a voltage range, the controller 410 ordersthe test of the semiconductor device.

After the normal contact of the probe needles is recognized using thetester, the semiconductor device is substantively tested using thecurrent.

According to an embodiment of the present invention, after the normalcontact of the probe needles is recognized using the probe pad in theEDS process, the semiconductor device is substantively tested using thecurrent.

Thus, when the probe needles abnormally make contact with the probepads, the alignment between the probe pads and the probe needles isimmediately corrected. As a result, the edge of the probe pad may not bedamaged with the probe needles so that the possibility of a failure ofthe probe pads may be suppressed.

Having described the preferred embodiments of the present invention, itis noted that modifications and variations can be made by personsskilled in the art in light of the above teachings. It is therefore tobe understood that changes may be made in the particular embodiments ofthe present invention disclosed which is within the scope and the spiritof the invention outlined by the appended claims.

1. A probe pad for use in testing a semiconductor device, the probe padcomprising: a square-shaped probing region adapted for contact with aprobe needle; and a sensing region adjacent an edge of the probingregion, the sensing region adapted for sensing whether or not a probeneedle makes contact with a position beyond the probing region, whereinthe edge of the probing region is rectangular having four sides and thesensing region is contiguous with all four sides of the probing regionrectangular edge, the sensing region having a first width contiguous afirst set of opposing sides of the probing region rectangular edge, anda second width different from the first width contiguous a second set ofopposing sides of the probing region rectangular edge.
 2. The probe padof claim 1, wherein the sensing region is non-square.
 3. The probe padof claim 2, wherein the sensing region is rectangular-shaped.
 4. Theprobe pad of claim 1, wherein the probing region and the sensing regionhave upper faces in substantially the same plane.
 5. The probe pad ofclaim 1, wherein the probing region and the sensing region have upperfaces in different planes and wherein the probing region upper face islower than the sensing region upper face.
 6. The probe pad of claim 1,wherein the sensing circuit is electrically connected to the sensingregion, and wherein the sensing circuit includes a diode coupled betweena ground and the sensing region.
 7. The probe pad of the claim 6,wherein the diode includes a P-N junction diode and a MOS diode.
 8. Aprobe pad for use in testing a semiconductor device, the probe padcomprising: a probing region adapted for contact with a probe needle;and a sensing region adjacent an edge of the probing region, the sensingregion adapted for sensing whether or not a probe needle makes contactwith a position beyond the probing region, wherein the probing regionincludes a conductive material.
 9. The probe pad of claim 8, wherein theconductive material is metal.
 10. The probe pad of claim 8, wherein, thesensing region includes an insulating material.
 11. The probe pad ofclaim 10, further including a sensing circuit electrically connected tothe probing region.
 12. The probe pad of claim 11, wherein the sensingcircuit is coupled to ground.
 13. The probe pad of claim 12, wherein thesensing circuit includes a resistor coupled between ground and theprobing region.
 14. A probe pad for use in testing a semiconductordevice, the probe pad comprising: a probing region adapted for contactwith a probe needle; and a sensing region adjacent an edge of theprobing region, the sensing region adapted for sensing whether or not aprobe needle makes contact with a position beyond the probing region;and a sensing circuit electrically connected to the probing region. 15.The probe pad of claim 14, wherein the sensing circuit is coupled toground.
 16. The probe pad of claim 15, wherein the sensing circuitincludes a resistor coupled between ground and the probing region. 17.The probe pad of claim 14, wherein the probing region and the sensingregion have upper faces in substantially the same plane.
 18. The probepad of claim 14, wherein the probing region and the sensing region haveupper faces in different planes and wherein the probing region upperface is lower than the sensing region upper face.
 19. The probe pad ofclaim 14, wherein the sensing circuit is electrically connected to thesensing region, and wherein the sensing circuit includes a diode coupledbetween a ground and the sensing region.
 20. The probe pad of the claim19, wherein the diode includes a P-N junction diode and a MOS diode.